A high-performance bridge steel q690qe plate unit welding deformation control method
A technology of welding deformation and control method, applied in the field of bridge manufacturing, can solve the problems of steel plate performance decline, repeated heating of plate units, high carbon equivalent, and achieve the effects of reducing welding deformation, feasible operation and simple process
Active Publication Date: 2021-12-10
中铁宝桥(扬州)有限公司 +1
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Problems solved by technology
The high-performance bridge steel Q690qE has a high carbon equivalent and strong sensitivity to welding cold cracks. It needs preheating before welding and dehydrogenation treatment after welding, which causes the plate unit to be heated many times, and the bending deformation after welding is more serious than that of ordinary material plate units; at the same time Due to the high strength of the steel plate, conventional high-temperature thermal correction may lead to a decrease in the performance of the steel plate; if the round-point heating method is used for medium-temperature thermal correction, the aggregation force generated by the thermal correction temperature is difficult to reach the yield strength of the steel plate, and it is difficult to eliminate the bending deformation of the plate unit
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Embodiment 1
[0034] The embodiment of the present invention provides a high-performance bridge steel Q690qE plate unit welding deformation control method, and the chemical composition of the high-performance bridge steel Q690qE is shown in Table 1 and Table 2 respectively.
[0035] Table 1 Mechanochemical composition of base metal of Q690qE bridge steel
[0036]
[0037] Table 2 Mechanical property requirements of base metal of Q690qE bridge steel
[0038] Plate thickness (mm) Rel(MPa) Rm(MPa) A(％) Rel / Rm -40℃ impact test (Kv2) Cold bending (180°) 16～50 ≥650 ≥770 14 ≤.0.87 ≥120J D=3a
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Abstract
The invention discloses a high-performance bridge steel Q690qE plate unit welding deformation control method, which includes: performing a heat correction test on the Q690qE high-strength steel to determine the heat correction temperature; Bending the middle part of the plate rib; lifting the two ends of the web, welding and tacking welding, and completing the pre-deformation; heating both sides of the plate rib weld to the preheating temperature, and welding the plate rib and the web; The two ends are padded, and according to the amount of bending deformation after welding, the counterweight is selected, and the counterweight is placed in the middle of the upper end of the rib; and heated to the heat correction temperature; after the rib is cooled to room temperature, the counterweight is removed. Complete plate unit correction. By setting the amount of pre-arching anti-deformation and welding with small heat energy, the welding deformation of the plate unit is reduced; after welding, the method of applying external force constraints and matching the local flame correction of the plate rib part solves the problem of thermal correction of the welding bending deformation of the material plate unit .
Description
technical field [0001] The invention belongs to the technical field of bridge manufacturing, and in particular relates to a method for controlling welding deformation of high-performance bridge steel Q690qE plate units. Background technique [0002] The development of the world economy has promoted the vigorous development of the transportation industry, and the development of railway and road transportation has promoted the development of bridge construction. In recent years, my country's bridge construction has made great achievements. A large number of large-scale bridges with novel structures and high technological content have made natural moats accessible. The steel used for bridges has also developed from the first generation Q345q to the sixth generation Q500q, and steel bridges are developing towards high speed, heavy load and long span. In order to meet the design requirements of Jianghan Seventh Bridge, Q690q, the seventh generation bridge steel, was developed fo...
Claims
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IPC IPC(8): B23K31/00
CPCB23K31/003
Inventor 杜伟穆长春刘志刚吴江波陈艳
Owner 中铁宝桥(扬州)有限公司